adverb taking the 'to' particle, adverb, noun or participle which takes 'suru'
cheerfully; happily; eagerly; lightheartedly
Describes moving or acting in a buoyant, excited manner, often with a spring in one's step. Frequently used with と and verbs of motion.
彼女はプレゼントをもらっていそいそと帰っていった。
She went home cheerfully after receiving the present.
He was eagerly getting ready before his weekend date.